



Always add weep holes.
Water always finds a way and ice is one strong mofo. Make sure water has a place to drain. Consider condensation being a factor too as a water source. Consider air holes on the top too to help avoid a vacuum from forming. Here are some trolly power line supports in Philadelphia. You can see the second one is seeing signs of the same damage. Less than 10 years old from my memory. My guess is condensation was forming in the poll and draining into the support then freezing.